Functions in Navigation Tables for Power BI Custom Connector

Thank you Anonymous. After some more research I've found that Power BI shows a slightly different message depending on whether the function accepts any parameters:

• If the function accepts no parameters, Power BI shows "No parameter values specified"
• If the function accepts parameters (doesn't matter whether it's documented or not), Power BI shows "Parameter value not specified"

I think the naming is a bit misleading. Also, it would be nice if the behavior was:

• If the function accepts no parameters, Power BI shows the results of calling the function
• If the function accepts parameters, Power BI shows UI to input these parameters (just like it does for the top level function), and then shows the results based on the provided inputs

 .

Source code:

[Version = "1.0.0"]
section TestConnector;

TestConnector = [
    Authentication = [
        Anonymous = []
    ]
];

TestConnector.Publish = [
    Beta = true,
    Category = "Other",
    ButtonText = {"Test Connector", "Test Connector"},
    LearnMoreUrl = "https://powerbi.microsoft.com/"
];

[DataSource.Kind="TestConnector", Publish="TestConnector.Publish"]
shared TestConnector.Contents = () =>
    let
        records = {
            [
                Name = "Function with no params",
                Key = "f1",
                Data = FunctionWithNoParams,
                ItemKind = "Function",
                ItemName = "Function",
                IsLeaf = true
            ],
            [
                Name = "Function with params (undocumented)",
                Key = "f2",
                Data = FunctionWithParams,
                ItemKind = "Function",
                ItemName = "Function",
                IsLeaf = true
            ],
            [
                Name = "Function with params (documented)",
                Key = "f3",
                Data = Value.ReplaceType(FunctionWithParams, FunctionWithParamsType),
                ItemKind = "Function",
                ItemName = "Function",
                IsLeaf = true
            ]
        }
    in
        NavigationTable(records);

FunctionWithNoParams = () as table =>
    #table(
        {"Column"},
        {{"Foo"}}
    );

FunctionWithParams = (name as text) as table =>
    #table(
        {"Name"},
        {{name}}
    );

FunctionWithParamsType = type function (
    name as (type text meta [
        Documentation.FieldCaption = "My Param Name",
        Documentation.FieldDescription = "Parameter description..."
    ])
) as table meta [
    Documentation.Name = "My Function Name",
    Documentation.LongDescription = "Function description..."
];

NavigationTable = (records as list) as table =>
    let
        _table = Table.FromRecords(records),
        tableType = Value.Type(_table),
        newTableType = Type.AddTableKey(tableType, {"Key"}, true) meta 
        [
            NavigationTable.NameColumn = "Name",
            NavigationTable.DataColumn = "Data",
            NavigationTable.ItemKindColumn = "ItemKind",
            Preview.DelayColumn = "ItemName",
            NavigationTable.IsLeafColumn = "IsLeaf"
        ]
    in
        Value.ReplaceType(_table, newTableType);

Since you say this is the expected behavior, I'll accept your solution, and I'll submit my suggestions in https://ideas.fabric.microsoft.com. Thank you!